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best
I'm not sure there's a 'best',as there is enough variation in front end designs with production vehicles that you've got to work with what you have.
From the available literature,the bulbous nose appears to best satisfy crosswind-averaged driving.Something like the Schlor Car,or this years Bochum University's Solar car.A perfect semicircle when viewed from above.
You could try something radical with cardboard and masking tape and see if it 'showed'.
The designers say that there is no magic radius or anything like that.Once you have attached flow,you're there.I can't imagine that the Matrix/Vibe front end would have any 'issues.'
Projecting the nose forward would allow a nice minimum dimension,airtight, Korffesque radiator inlet duct.
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